Measuring instrument.



R. E. BYRD.

MEASURING INSTRUMENT.

APPLICATxoN mio Aus.1s.1s|1.

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Patented Dec. 3, 1918.'

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ti 'ra IArs ROBERT E'..RYRD. 'OE ERIE, PENNsYLvANIA, AssIGNoR rro MODERN Toon COMPANY,

' or ERIE, PENNSYLVANIA, A CORPORATION OE PENNSYLVANIA.

. MEA'SURING INSTRUMENT.`

1 To @ZL/whom z'tfmag/ concern.'

. scale.

Beit known that I, ROBERT E. BYRD, a citizen of the. United States, residing at Erie, in the-county ofi Erie and Statey of Pennsylvania,have invented newv and vuseful Improvements in Measuring Instruments, ofI whichfthe following is a specification.'`

This in-vention relatesto measuring instruments and cosistsin certain' improvementsin the construction thereof as will be ,hereinafter fully described and ,pointed out in the claims. v .Moreparticularly thev invention relates to` instruments designed for measuringthe distances ybetween the threadslor grooves so as to determine with accuracy the spacesor pitch of s'aidthreads Vor grooves.

The invention isil-lustratediin the accompany'ing drawingsas follows y` Figure l'` shows a-plan` View offgthe 1nstrument; g I

Fig. 2a side elevation of the same. Fig. 3 a section of a fragment of the instrumenton the' line' 3-.3 in Fig. l.

' Fig. 4 a section on the line 4 4: in Fig. 2. Fi'g.^5"azplanfviewfof the master gage. v Fig. 6 an end View of said gage. The instrument has two members slidingly mounted relatively to each other, one in the form of a sleeve B and the other in the form of a plunger K. The plunger and sleeve have graduations forming a Vernier scale R. These give a reading of .0005 of an inch using the Vernier scale of measuring, the lines on the sleeve being .025 apart and the plunger K .024 apart. The sleeve has a series of openings b along its face and a series of screw -threaded openings b opposite the openings b. A ball-pointed measuring pin C is secured to the sleeve by passing the end of this pin through an opening b and screwing it into the opening b.

A ball-pointed measuring pin D is mounted on the plunger K. This pin is preferably adjustable relatively to the plunger so as to correct its position relatively to the To accomplish this the pin D is carried by a block E. The block E extends into a transverse slot in the end of the plunger K and is pivotally mounted in the slot by means of a pin P. Screws L extend through the block E, one at each side of the pin P. By adjusting these screws the block E may be swung so as to move the point D to the right or left so as to properly pokSpecification of Letters Patent.' ik

Patented 1390.3, 19158.

Application led August 18, 1917.4 Serial No.' 186,853.

sition it to give azero reading on the scale when the points are .corrected with the master gage O, the master gage O having grooves accurately distanced for this purpose.

A rest plate A is adjustablyl secured to the sleeve B.' '.Lhe purpose of this plate is to form a support for an article, the grooves in which are being measured. Such an article', as for instance; a screw, is placed on the plate, and the points are adjusted solas to bring the pins carrying the points into-aradial directionl relatively to the axis of the screw. The plate is locked in this position` and inthismanner the article can be readily held relatively to the points and a readingy taken. j

The plate Vhas the'lips a which extend face to t the lipis placed between the lip a and the headofthescrew'.v A spring N is j arrangedin a cavity.v in theuwasher torhold the washer 1n place as the screw 1s loosened.

There i s preferably one' of these adjusting? screws 1n each lip and there is one lip at each end of the sleeve. By loosening these screws the sleeve may be swung in the lip, the springs giving a slight frictional resistance to this movement so as to hold it in place as the screws are tightened. When the proper adjustments are made the screws are tightened and the parts thus locked.

For convenience of the operator I provide a thumb-hold clip H which is secured to the sleeve by means of a screw J. The washer I having a concave face is arranged between the screw J and the plate.

What I claim as new is 1. In a measuring instrument, the combination of two relatively slidable members comprising a sleeve and a plunger within the sleeve; a measuring point on each member, the point on the sleeve being detachably connected and the sleeve having a series of means for attaching the point to vary the measuring distances between the points; and a scale for indicating the relative movement of the members.

2. In a measuring instrument, the combination of two relatively slidable members comprising a sleeve and a plunger within the sleeve, one of said members having a transverse slot; a measuring point oneach members in positionk to support an object inv measuring-relation to said points, said plate being in aV plane parallel to a line between the points. l

4:. lnfa measuringl instrument, the combination of two relatively slidable members; a measuring point on eachmember; av scale indicating` therrelative movement oli, the members; a rest plate secured to said memberslin position to support an objecty in measuring i relation to said points; andy means .for adjustingfthe plate to vary the distances between the plate and point.

5. lin a measuring instrument, the combination of two relatively slidable members; l

a measuring point on each member; a scale indicatingy the relative `movement -of the members; and a rest plate secured to one of said members inrposition-"to support an object inmeasuring relation to said points, saidy plate being swingingly 4mounted to adjust its position relatively vtofsaid points.

dln a `measuring instrument, the com- Cnpies'rof .thisv pateiitmay ,ne obtained for nastreeft Vbination of two relatively slidable members;

a measuring point on each member; a scale indicating the relative movement 'of the members; a rest plate secured to one of said members in position to support an object in measuring relation to said points, said plate being swingingly mounted to adjust its position relatively to said points; and means for locking the plate in adjustment. y

7. In a measuring instrument, thecombii nation of two relatively slidable members;

a measuring point on each member; a scale 1 indicating the relative movement of the member; arest platesecured to one of said members in position to support an object inl measuring relation to said pointsgsaid plate beingfswin ingly-mountedeto adjustits position relatively to said points; a screw for locking the plate in` adjustment; and a spring-pressed washerbetween the screw and plate. j f- 8 na measuring instrument, the combination of two'relatively slidable members;

a umeasuring point on each member; a scale indicating the relative movementf of the members; a rest plate securedto said memv bers in position tosupport an object in measuring relation to said points; andra thumb grip plate opposite the rest plate.

In testimony whereof l have hereuntoisetV my hand. v v

` Bonner E. Brani.

veeents cach, by addressing the "(lminimissimuler` of Patents, Washington, D. @3" f 

